Interesting, I was not aware of that feature. It appears to be a hardware feature. works with control+ alt+ enter on my machine.

--Devin


On 12/11/2016 11:58 PM, Sam O'nella wrote:
I'm not sure specifically on the z-160 but my z-150 had it (iirc and it's been 
a while ctrl+alt+ins or ctrl+alt+enter) I think put you in the diagnostic rom 
which had a debugger.
Curiously though i dont know if that is a hardware function or a feature of 
zdos?
-------- Original message --------From: Fred Cisin <ci...@xenosoft.com> Date: 
12/11/16  6:59 PM  (GMT-06:00)

Don't those machines have a debugging monitor in ROM?  (something that IBM
does NOT)  Otherwise DEBUG.COM should work.

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